Method of making bobbin rings



Sept. 11, 1934.

J. F. HJORT METHOD OF MAKING BOBBIN RINGS FiledAug. 28, 1951 4 Sheets-Sheet 1 [mamm- JOHN E f/Joe Sept. 11, 1934. F, HJQRT 1,973,436

METHOD OF MAKING BOBBIN RINGS Filed Aug. 28, 1931 4 Sheets-Sheet 2 JoH/v f. 50067,

Sept. 11, 1934. J, F mo 1,973,436

METHOD OF MAKING BOBBIN RINGS Filed Aug. 28. 1951 4 Sheets-Sheet; 3

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JOHN E HJOET,

Sept. 11, 1934. J. F. HJORT METHOD OF MAKING BOBBIN RINGS Filed Aug. 28, 1931 4 Sheets-Sheet 4 jzoni'am: ./0///\/ A Ava/er,

Patented Sept. 11, 1934 METHOD or MAKING BOBBIN n nes. John, F. Hjort, Worcester, Mass, assign or to The American Steel and Wire Company or New Jersey, a' corporation 'of New Jersey Application Au usms, 1931,. Serial Nhij'ssonoe' 2 Claims. (o1. 29-170) This invention "relates to an improved method of making bobbin rings. The practice most generally followed inmaking'bobbin rings for the textile industry is to feed the wire stock from which the ringsare produced into a forming machine, the wire being cut in" suitable lengths and then bent' around a mandrelaof. suitable diameter.-i'i-w' i As will be understood by those skilled in the art, the purp'oseof thebobbin'rings is to protectthehead ofthe bobbin from breakagaand provide 'asuitable means for removably" holding the bobbin in a shuttle. The shuttle is provided with a pair'oi' flat grooved springs at one end, which springsare providedwith grooves to re ceive the bobbingrings; 'When'the bobbin is forced into the shuttle the flat springs open up or-spread and allow the ringsonthehead oi thebobbin to enterthe grooves, thereby holding the bobbinin its proper position while the shuttie is in operation". I

When the bobbins are stripped or removed from the spinning'frames they are thrown into trucks, "and no care is taken to prevent the rings of one bobbin from coming in contact with the yarn'on'anoth'ee bobbin. This is very serious, since when rough rings are used they snag the yarn of the other bobbins, and cause snarls and tangles and otherwise damage the yarn so that it must be destroyed.

It is desirable that the ends of the rings be perfectly smooth and substantially closed when assembled on the head of the bobbin. Heretofore the rings provided for this purpose had a rough jagged surface in cross-section, while the rings produced by this invention have a smooth end and will not snag the yarn on their own or on another bobbin.

It has been found that the foregoing defects result from the method of cutting the ends of the lengths of wire from which the rings are formed.

If the wire is cut squarely Where the ends of the rings join a pinching action takes place and these ends will, in most instances, present a rough jagged surface in cross-section and the inner contour of the ring will be irregular or dipped at this point. If, however, the ends ofv the wire are sheared or cut at an angle or plane inclined toward the inner curvature of the ring and Without a pinching-in action, the inner curvature of the ring will remain substantially unbroken and the ends of the wire will present a smooth cross-sectional surface con tour.

'- The present method'of producing bobbin rings, therefore, consists broadly in bending suitable lengthsof wire in the form of a: ring and shearing" or cutting the'endsof the wire at an angle or planeg-inclined"toward the.v inner curvature of the ring." g

: Theresultant product-isja bobbin ring having a regular, substantiallwnnbroken, inner surface curvature and beveled ends which present a; smooth rounded contour in cross-section.

.JI-he drawings illustrate a preferred typeof mechanism and *manner of "carrying out the method in successive steps but it will be understood that. any desired tools orv mechanism, as well asany desired sequence of operations, may be adopted without departing from the scope of the invention. 2

. In the drawings:

Figures-l to-5, inclusive,-illustrate a'mandrel and a set of tools and the various positions 5 thereof during .the successive steps of the method. w

-- Figures 6 and 'T'illustrate preferred types of cutting tools. s

Figure B illustrates the finished product.

- Figure-9 is-a'plari-yiew of a'shuttle and bobbin withthe rings of this invention in place.

Figure 10 is a plan of the bobbin removed from the shuttle.

Figure 11 is a perspective view of the bobbin receiving spring end of the shuttle.

The reference numeral 5 designates a shaping mandrel formed with a reduced end or extremity 5 (note Figure i) 6 a binding tool, and '7, s, 9 and 10 shaping tools or dies which 99 cooperate to press the wire around the mandrel; 12 designates male cutting or shearing tools and 13 and 13 female cutting or shearing tools.

Figure 1 illustrates the first operation, the wire being fed into the machine over the small end portion 5a of the mandrel 5 and out, leaving squared ends, the binding tool 6 holding the wire in place. The female tool 13 has a doublecutting edge to provide for this initial severing #9 operation. 7

After the wire is cut, tool or die '7 bends the wire to an angle of approximately thirty degrees as shown in Figure 2, and cutting tools 12, 13 and 13 then move into cutting or shearing relation and shear off the ends of the wire at an angle, leaving a rounded and beveled end. 7

The cutting tools are illustrated in Figs. 6 and 7, Figure 6 showing the male cutting tools and f of the male cutting tools with the squared ends on the ribs 14. The ends of the wire are thus sheared at an angle and simultaneously rounded and beveled (note Figure 8).

After the ends of the wire are sheared as just specified, tool or die 7 bends the wire around the small end 5 of the mandrel5 to the position shown in Figure 3.

Shaping tools 9 and 10 then move toward the mandrel and form the Wire into an approximate pear shape, as shown in Figure 4. These tools then move back or retract and tool or die 7 releases the wire sufficiently to permit the mandrel 5 to move further into the partly formed ring and expand the latter over the enlarged portion of the mandrel, as shown in Figure 4 This operation increases the diameter of ring to the'desired size and reverses the internal strain of the wire to an inward recoil, thus providing for the production of a ring with closed ends when using a high carbon grade of steel which is slightly annealed.

The final operation is shown in Figure 5, tools 8, 9 and 10 moving into cooperative relation with the mandrel and completing the ring as illustrated in Figure 8.

In order to illustrate the use of the rings produced by this invention I have-shown a shuttle and bobbin assembly in Figure 9, and details of the bobbin and spring forming parts of the assembly in Figures 10 and 11.

The shuttle consists of a body portion 20 which is reduced in cross-section to form pointed ends 21, each of which is provided with a metal tip 22. The body of the shuttle 20 is {splitting of the heads and attaching members for securing the bobbin to the spring 24.

The above described shuttle and bobbin construction is of standard, well known design, and

will not be described further in detail, since it does not form any part of this invention.

What is claimed as new is:-

'1. A process of producing bobbin rings, in-

,cluding providing a suitable length of wire, re-

straining the central portion of said wire, applying similarly directed forces right-angularly to either side of said central portion of said wire to bend the latters end portions until they are at an angle to each other, shearing the ends of said wire in'directions substantially the same as those of said forces and applying further forces to said wire directed to bend it to ring form with its ends in mutually abutting relationship,

' 2. A process for producing bobbin rings, including providing a suitable length of wire, associating a round object with the central portion of said wire, applying forces right-angularly to said wire at either side of said object and directed theretowards so as to bend the wires end portions until they are at an angle to each other, shearing the ends of said wire in directions substantially the same as thoserof said forces, applying forces to bend said wire about said round object sufficiently to bring its ends 1.15 adjacent, removing said object from said wire so bent and substituting a larger round object in its place and bending said wire to ring form about said object with its ends in mutually abutting relationship.

l JOHN I-IJORg'I. 

